Hydraulic jack



B. GOLDMAN HYDRAULIC JACK Dec. 9, i930.

Filed April 8, 1929 3 Sheets-Sheet l Dec. 9, 1930. B. GOLDMAN 1,784,428

HYDRAULIC JACK Filed April a. 1929 5 sheets-sheet 2 khad B. GOLDMANHYDRAULIC JACK Dec. 9, 1930v` Fil-ed April 8, 1929 3 Sheets-Sheet 5Patented Dec. 9, 1930 PATENT OFFICE BARNEY GOLDMAN,` or NEW YoRK, N. Y.y

HYDRAULIC JACKY Application filed April 8, 1929.` Serial No. 353,390.

l Thisinvention relates to new and 'useful improvements in hydrauliclifting jacksand comprises a device .of this kind which 1s adapted to bepermanently secured to a ve- 5 hicle, and having a. part adapted to beforced therefrom by iuid under pressure and comprises devices controlledand within reach of the operator, while seated behind the steering wheelofthe car, whereby anyror all the jacks may be moved into ank operativeposition and then expanded by liquid under pressure, for the purpose ofliftingany selected wheel or the entire body of the car vfrom theground.

, An object of the invention. is to provide a,

suitable hydraulic pump operated either manually or bymeansfofpconnection with the engine of the automobile, and controlledwithinthe reach ofthe operator when seated behind the steering wheel,for the purpose '20 of forcing a liquid, stored in a tank, into any oneof the selected jacks. f

. Another ob `ect ofthe invention is to provide jacks which are subjectto operation in one 'direction by hydraulic power, and 1n the .2.5reverse direction when the hydraulic power isrelieved, by the weight ofthe vehicle and toa further extent by a suitable valve 1nechanisnrwhichforces the acks to normally fold up horizontally under the car whiletravelling on the road. y

Another object of the invention is to provideA a selecting device withinreach of the operator, whereby any one or all the jacks may be connectedby flexible means .to a distributing device under the fioor or footboard, thereby preventing any oil leakage in the interior of the ear.

Another object of the invention is to provide a simple locking oranti-rattling device for the jacks while in an inoperative position whenthe car is travelling on the road.

And still another object of the invention is to provide means wherebythe pressure of the. liquid will first move the jack from a 454 lockedhorizontal into a vertical or operative position and then expand sameand at the end of the. operation will move the contracted jack back intoa horizontal position into a locking4 device.

With these and other objects in view, the

invention consists in the details V.of construction and arrangement ofparts to be hereinafter more fully described, claimediandfillustrated inthe accomlmnyingl drawings in which similar numeralsofv'refelencedesignate corresponding parts throughout the several viewsin which y v A ,A 1

Fig. l represents a plan viewof an automobile, shown in dotted lines,rwith the in-` vention shown diagrammatically in full lines. Y y

Fig. 2 is a longitudinal section ofa porti-on of an automobile, showingthe location ofthe several parts of the invention diagrammatically. i

Fig. 3 is a cross-section` on Fig. 6.

Fig. 4 is a vertical cross-section on line H of Fig. 5 showing the jackready to be expanded.

Fig.,5 is a vertical section on line 5 5 of Fig. 4 showing lockedposition. Y

Fig. 6 is a verticalsection on line 5 5 of line tie-3 of Fig. 4 showingthe valve and the jack iny an` expanded or operative position. Fig: 7isa similar section of the valve and acl ready to be moved back intoitslocked position.

Fig. 8 is a horizontal section online 8-8 of Fig. 5.

Fig. 9 is a face view of the selecting device on the instrument board.

Fig. 10 is a vertical cross-section on line lO-lO of Fig. 9.

Fig. 11 is a vertical lcross-section of the manifold on line 11-11 ofFig. 12. and

Fig. l2 is a horizontal section on line 12-12 of Fig. 11.

In the drawings the numeral l5 designates the chassis of an automobileshown in dot-ted lines in Fig. l. having front and rear axlesl-lfprovided with wheels 18-l9. The selecting tievice 2O is mounted onthe instruy ment board 2l in reach of the operator. The

distributing device Q2 is mounted underneath the tioor Q3 of the car andis connected to the selecting device 2() with exible shafts 24. Thestorage tank 25 is mounted underneath the floor 23 and is connected tothe disA the jack in an inoperative or the floor of the carrhavingatitsapexya knoll 32. Interposed between theffloor-QB andthe i pump-lever30 is a. spring 33 for the purpose of returning said lever to its normalpositioiim as shown in Fig. 2. lVlien the upright rod ill is depressedby the operators foot, whileseatf.y

ed on the seat 34 the liquid is forced intothe` distributor and at theend ofthe stroke7 the spring 83 will restore. the pump-handle 8() to itsnormal position. The jack 35 is mounted-A uiiderneath the axles 16--17and is connectedl to the distributingv device 22 by pi pesi-i6 having atits outer ends a flexible tube 37 which :connects with rthe controllingval-ve 38 of By referring to Figs. 9-410 it will -be vseen that ther.selecting device Q0 consists of a housing y39 fastened tothe'instrument board ll by a ringe() and screws 4l. In'this lions-,-

' plate 77. 'A stud 78 is screwed into the centre ing are moiintedtorotate small rollers 4:2 having shoulders 43 on each end of same andarelield iii place by a plate 4st 'fastened to the back of .same byscrews 45. vThe front-end of these rollers are flush with the ring 40and' has a slot 46 for the reception of asinall key 46a shown in dottedlines of Fig. il, for the purpose of rotating saine. 'lhe backend ofsaid roller projects somewhat 'through the ring 44. To the centre ofthefroller 42 at theI rear end thereof is fastened a lexible shaft 24.The other end thereof connects with the distributing device 22.

By, .referring to Figs. l'1.-12,it"will be seen that the distributingdevice Q2 consists of a hollow cylindrical housing 47 into which, at thebottom thereof. are Vfastened tive needle valves 48 of the angular type,by lock! nuts 49. The upper portions of these `valvesI are fastened to aplate Owhich fits into a recess 51 formed in the flange. 52 of thehousing :1.7. A ring 53, fastened to said tlange by screws 54 forms atight'joint of the device.

To the upper ends orstems of the valves are attached sleeves 55 whichconnect Lsame tothe flexible shafts 2l. To the lower ends of the l'oiiroutside valves connects a pipe 36: which iii turn connects with thejacks 35. rl`lie lower end of the centrally located valve connects withthe tank through pipe Q6. A'pipe 29 is screwed into the lower portion ofthev cylindrical casing which connects same to the 'lischarge pipe fromthe pump. At the outside lower portion of the casing 47 are. extendinglugs 56 for the purpose of attaching same to the bottom of the Hoor 223ot the cai".

Bv' referring to Figs. -l-i'i, it will be seen that-the jack 35comprisesahead 57 swingingly mounted on triiniiioiis .5S-59 in the clamp6() which is fastened to the axle 16. AThe Ving 66, held in position bya nut 67.

" strikes uneven nion 5S).

the head 57 is screwed a tubular member 62 which at its lower end has apacking (Sil held in position by a nut 6l. The tubular member (Missurmounted by another tubular member 'whi'ch als'ohas at its lower end apack- This tubular member fits into another tubular v'member 68.'lli'e'lower end thereof is screwed .intoa rbase- 69.

n rlhe tubular member 65 has at its upper and lower ends flanges 70,which r`coactwitli similar flanges on sections (iQ-68, and act as guidesand also to linnt the movements of said tubular members when the jack isexpanded.' Into the lower portion. ofthe.k jtubiilar member 68- tits aplate 7l to which is l Vfastened a small eye`72. Interposed between'this eye and trunnion .5S-is aspring 73 for 'the purpose of contractingthe jack after bef ing expanded'. "l

The upperportion 74 of the base 69 has at 7'? tits the convex sphericalportieri` 76 of the Vits lower enda spherical cavity 75 into which f 79which coacts withv another spherical cavity 80 ofthe plate 77. Theopening at the bottom is closed by`a plate 81. 1t will now bc versaljoint, so that. when the end of the jack ground, the base 69 will adjustitself thereto.l

'.lhecontrol valve 38 is made flat on the f nback side where it tits upagainst the clamp v60 and is 'fastened to the jack 35 by means of' thehollow trunnion 59and'is mounted to slide 'vertically on the beveledsides of the clamp Y. '(50, and held iii-position by bolts 82 passingthrough verticallyT elongated slots 83. The

so that when'the jack is placed in an oper-y ative 'inisition' it 'willbe freeto move up` until the head 5T comes in contact with the under'side ot the clamp 60.

'lhe valve 88 has two different sized bores S7- 8S and is closed atleachend bv caps 89.-

90. vInto the bores ST-SS itsa tubular piston scen'that thisconstruction constitutes a nni- 'Y iio 91 provided with a packing ateach end, the

object thereof to be described later. middle lower portion of saidpiston has teeth The 92 -iiiesh-i'ng with a pinion 93 which is fas-'lltened to the square end kof the vhollow trun Back of the gear wheelS33-is a packing Qlwhich prevents leakage aroundy the truniiion. "Infront of the pinion 9?) is a i' `cap 95 which has small channels 96 sothat the oil can pass from the valve into the hollow trunnion 59, thenceinto the jack This arrangement is clearly shown in Fig. 4.

At the left hand end of the tubular piston 91, see Figs. 5-6-7, is anannular recess 97 for the reception of a packing 98, fastened to the endof the valve stem 99 which passes through the centre bore 100 of thepiston 91. Another packing ring 101 facing in the opposite direction lisalso fastened to the valve stem by a nut 102 and a follower 103 againsta shoulder 104 on the valve stein 99. Adjacent to the recess 97 is anannular collar 105 which isground to a tight fit into the bore 97. Atthe opposite end of the. piston 91 is an annular collar 10G. This formsa stop for the packings 107 which are held in position by a nut 108having a squaie hole 109 in its centre, through which the square end ofthe valve stein 99 passes. rIhe obj ect of this is to keep the valvestem from turning. Inter- Lposed between said nut and a shoulder on thevalve stem is a spring 110 and at the outer end of the square end is asmall cotter pin 111 which limits the forward movement of the stem. Thenut 108 has holes 112 through which the oil passes into the large end ofthe valve.

By referring to Fig. 3, it will be seen that the packing 98-101 is cutoff at the sides oi' in other words, the only contact with the cylinderat the top and bottoni leaving a space at each side thereof. The objectof this construction is, that when the pressure of the oil presses thepistonv 91 towards the right, a tight joint is maintained between thepacking and the endof the piston, but when the pressure is released thespring 110 will press the packing forward, thereby closing `the ports114 and when pressure is again applied, the oil will pass by the packingand into the large end of the valve.

Ports 114 are drilled into the body of the valve just in front of thepacking 101 when the jack is in a vertical position shown in dottedlines of Fig. 5, and terminate into a chamber 115 into which the gearwheel 93 is located. At the opposite side of said chamber is a smallvent 116A which connects with the large end of the cylinder 88. Theobject of this is, that after the jack is restored to a position shownin full lines of Fig. 5, the pressure will be equalized and the oil willdrain back into the jack.

Willen the jack is in an inoperative position as shown in Fig. 5, it isheld and kept from rattling by a spring 117 which straddles the jack andis fastened to an extended portion of clamp 60.,

Into the end of the pipe 37 Where it enters the valve is fastened asmall spring 113 for the purpose of closing the valve stern 99 againstthe end of the piston 91. It will be understood that when the pistontravels towards the left this valve is kept open by the tension of thespring 110 and at the end 'llhe'puinp is now operated and the oil underpressure enters the control valve. The pressure now moves the pistontowards the ri glit, thereby releasing the jack from the clamp andturning it down into a. vertical position, shown in dotted lilies ofFig'. 5. 'l`hc piston has now reached a ,position shown in Fig. l anduncovered the inlet port lli. 'l`he tiuiil now passes through thisportinto the gear chamber and thence through thehollow trun nioiitherebv expanding' the jack and consequentljv lifting part of thecarfrom the ground. lt will be seen that the pressure is also against oneside of the packing in the large end ot' tlu cylinder which has atendency to hold tln jack in an upright position. When it is desired tolet the car down, after the repairs have been made, the centre valve .inthe dis-v tributing device is opened and the oilv will How in a reverse.direction into the storage tank, by reason of the weight of the car onjack, and then the spring 73 will contract the jack and when thepressure against the packing is exhausted, the spring back of the valvestem will force same toward the left, thereby covering up thejnl'etport.

If the relief valve is now closed and liquid again under pressure isintroduced into the cylinder, the liquid will now pass around thepacking at the end of the valve stein and through the hollow piston intothe large end i of the controlv valve, thereby forcing the pis ton backto its normal position shown in lnll lines of Fig. 5. i

As the piston moves toward the left. al the end of its stroke, the endof the valve stem comes in contact with the small spring in the inletpipe, therebuvY pushing the same back until the packing comes in Contactwith the end of the piston, by this time the jack is held in its lockedposition by the anti-rattling spring. The valve is now closed and thejack remains in this position.

l elaiin:-

1. In a hydraulic jack the combination with a head adapted to fasten toan object, of telescopic tubular plungers swingingly mounted on thehead, a tluid inlet leading into the head, a port in the head atpredeter# mined times communicating with the plung-` ers, a tubularpiston slidinghvv arranged in theheadadaptedto swingr the plungersdownward and upward. a valve having a stem slidably arranged in thepiston, said valve including means controlled b v the position ol li l()4 Y Y iffsifiaaV the piston lo cover or uncover the port by the:ietuution of the vulve'.

2.111 a hydrnulieI jack the. combination' with ai heud adapted to fastento :in object, of telescopic tubular plungers Swiiigingly mounted Vonthe herald, a fluid inlet leading into the head, n port in the head :itpredetermined times eoinniunieuling with the plungers, u tuhulfu' pistonSlidingly :irrnnged in fliel md iidill'ited to swing the plungers down#`wurd und upward, :i vulve huvingn sleni slidzihly :irrunged in thepiston. Suid vulve in vinding means4 controlled by the position of Ihepiston to cover or nneovel the port hy uidei'ienden'r :utuution of thevulve governed hv the movement of 'the piston.

with u heud adapted lo "fusion to un ohjeel', ol' teleseopie tuhulnr-plungers wviiigiiigljiv mounted on the head, u fluid inlet"lendingvinto the hezid,v zi port in the head atfpredei'erf n mined timeseominniiiefiting with the plungers. :i tulmlzlr piston slidinglyarranged in the hen d adapted to swingr the plungers down wurd andnl'iwnrd, u vulve having` :i stein' `lidnlily arranged in the piston,sind vulveincluding means eoiitrolled hy the position `of the piston toopen 0i' close the port by iinlependentfly actuating" the valve wliiehislgoverned by the movement-of the piston, the said vulve being designedto openV 0r close the bore of the tubularpiston.

4. In zr `hydraulic jack the eorvnbinatioir with .fihead :ida )ted tofasten to an object, o telescopic tuli mounted on the head, u fluidinlet leading .into the head, :L portvin the heard ut predeterminedtimes eomniuiiieuting with the plungers, :i tubular pis'fl'onslidinii'ly arranged iii` lending lfrom the hemd into the plungers .torelieve the pressure of the fluid from the rear end of the piston.

lSig'iiofl :il New York, in the County of New Yorkl and Stute of NewYork this 4th diiy of' April, A. D. 1929. l

' BARNEY GOLDHAN.

ulur plungers swingingly

